How do I write to a .txt file in Android?

Question

I have an app that needs to read and write to a text file. I have it reading, but I don\'t have it writing. The idea is that when I click the save button on the screen, its

Answer 1

with mari's solution i was getting

       java.lang.IllegalArgumentException: contains a path separator

then i tried following and it worked for me

  File root = new File(DIRECTORY_PATH);
  File gpxfile = new File(root, "samples.txt");
  FileWriter writer = new FileWriter(gpxfile);
  writer.append("First string is here to be written.");
  writer.flush();
  writer.close();

you can loop it to write multiple lines